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ABSTRACT
In engineering practice, plates are often reinforced by longitudinal ribs. These ribs introduce structural anisotropy. Consequently, classical plate theory for isotropic plates must be modified to account for this anisotropy. The response of such plate structures is described analytically by the theory of orthotropic plates, provided that the plate-rib structure is accurately modeled as an equivalent orthotropic plate. In previous work by the authors [1], a simplified procedure for determining plate rigidities was suggested. The suggested solution has been shown to be a reasonable approximation for the deflection of cross ribbed plates. This investigation is an application of the solution of Ref. 1 to the stability of the longitudinally ribbed plate.